Punch and die



Jan. 1, 1957 G. w. SODERMAN ,77 0

PUNCH AND DIE Filed March 8, 1952 INVENTOP G. W. SODERMA/V United States Patent PUNCH AND DIE George W. Soderman, West Englewood, N. J., assignor to Western Electric Company, Incorporated, New York, N. Y., a corporation of New York Application March 8, 1952, Serial No. 275,477

1 Claim. (Cl. 164118) This invention relates to tools, particularly inexpensive punch press tools.

Punch press tools such as punch and die sets when made in the usual ways, are costly to manufacture and maintain. Such tools have a long useful life, however, and when they are used to make a very large number of parts the tool cost per unit part is not excessive. On the other hand, when only a limited number of parts is required the tool cost is a large factor in the total cost of the part and in such cases inexpensive tools are highly desirable.

The object of the present invention is a punch and die set which is simple in structure and which may be produced inexpensively.

With this and other objects in view, the invention comprises an inexpensive punch and die in which a series of plates of like contours are bored simultaneously to produce in one a die cavity, in another a punch receiving aperture and in a third an aperture for passing the punch so that it may serve as a stripper plate. When desired, a plurality of sets of such apertures may be formed in the plates to enable the tool to make multiple perforations in the work in one operation. Since the punch holder, stripper and die plates are bored while clamped together, alignment of each punch with the corresponding stripper aperture and die cavity is assured merely by mounting the several plates in proper position between the base and ram of a press. A resilient member, formed of suitable material of a given thickness and provided with an aperture for each punch and other cutout portions to allow compression of the member, is disposed between the punch and stripper plates and cemented thereto to form a unitary punch assembly which is cemented to the under surface of the ram. The die plate is cemented to the bed of the press while the punch assembly and the die plate are closed under pressure of the ram.

Other objects and advantages will be apparent from the following detailed description when considered in conjunction with the accompanying drawing which is a front elevational view of the punch and die mounted in a punch press.

The species of the invention shown in the drawing, includes punches 50, 51 and 52 out of given lengths from stocks of predetermined cross-sectional contours. A punch plate 53, a stripper plate 54 and a die plate 55 are cut from metal strip stock of like or different thicknesses. These plates are clamped together and apertures bored therein for the punches 51 and 52. After the boring operation, the plates 54 and 55 are clamped together and apertures bored therein for the punch 50. A resilient member 56 is formed of the proper size and contour and 2,776,008 Patented Jan. 1, 1957 provided with apertures for the punches. Another resilient member 57 is formed to be received in and fill the die cavity for the punch 50. The various parts 50 to 57 inclusive, are provided with suitable cement on the proper surfaces thereof and assembled on the bed 58 of a press after which the tool holder 59 thereof is moved into closed position under pressure and held in this position until the cement on the parts has hardened.

The punch and die structure is sufficiently serviceable for many operations yet inexpensive to manufacture so that the cost of the products may be low. Furthermore, complicated mounting means and stripping mechanisms are eliminated together with costly castings, forgings or the like, requiring hardening processes, complicated machine operations and costly maintenance.

It is to be understood that the above described arrangements are simply illustrative of the application of the principles of the invention. Numerous other arrangements may be readily devised by those skilled in the art which will embody the principles of the invention and fall within the spirit and scope thereof.

What is claimed is:

The combination with a press having a bed and a reciprocable tool holder, of a punch and die comprising punches cut from rod stocks of given uniform cross-sectional contours, plates cut from metal plate stock, identified as a die plate, a punch plate and a stripper plate, having an aligned set of apertures in all the plates for one of the punches and an aligned set of apertures in the stripper plate and the die plate only for another punch, means to removably cement the punch plate and the upper end of the punch in the aperture thereof to the tool holder of the press, means to removably cement the other punch to the punch plate in alignment with its respective apertures in the stripper plate and the die plate, a pad of resilient material of substantially the contour of the plates, perforated for the punches, disposed between and removably cemented to the punch plate and the stripper plate thereby to be supported by the punch plate and to support the stripper plate, means to removably cement the die plate to the bed of the press, and a pad of resilient material substantially of a size and contour to fill one of the die cavities removably cemented to the bed of the press and compressible by the aligned punch.

References Cited in the file of this patent UNITED STATES PATENTS 173,062 Robertson et a1 Feb. 1, 1876 414,288 Carpenter Nov. 5, 1889 418,534 Shipley Dec. 31, 1889 828,226 Lorenz Aug. 7, 1906 1,288,054 Lane Dec. 17, 1918 1,402,284 Daniels Jan. 3, 1922 1,533,681 Witkus Apr. 4, 1925 1,602,687 Leschhorn Oct. 12, 1926 1,960,881 Sunbury May 29, 1934 2,230,043 Moran Jan. 28, 1941 2,278,288 Sadler Mar. 31, 1942 2,324,143 Erdrnan July 13, 1943 2,379,003 Hedberg June 26, 1945 2,388,528 Curtiss Nov. 6, 1945 FOREIGN PATENTS 488,552 Great Britain July 8, 1938 

